Comparison

Amazon Kindle vs KyBook 3 Ebook Reader

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Amazon Kindle

Access and read millions of ebooks, magazines, and comics on your device. Customize your reading experience with adjustable text, brightness, and layout. Sync your progress, notes, and highlights across all your devices seamlessly.

Highlights
  • Access millions of ebooks, magazines, and comics
  • Customize text size, font, and layout
  • Adjustable brightness and background colors
  • Built-in dictionary and Wikipedia lookup
  • Track reading progress with page numbers
  • Sync reading progress across devices
  • Seamlessly switch between reading and listening
Features
Currently charting
Read full description

READ ANYTIME, ANYWHERE On the bus, on your break, in your bed—never be without a book. Kindle books you have purchased on Amazon will automatically appear in your app. Kindle Unlimited and Amazon Prime members can select and download Kindle books directly in the app. FIND YOUR NEXT GREAT READ • Read the books you buy on Amazon in the Kindle app. Choose from over six million Kindle books (including those with Audible narration), magazines, and comics and start reading in seconds. Explore Amazon Charts best sellers and titles across genres like romance, science fiction, children’s books, self-help, religion, nonfiction, and more—and try any book with a free sample straight from the Kindle app. • Kindle Unlimited members can enjoy unlimited reading and listening, with the freedom to explore over 1 million titles, thousands of audiobooks, and current magazines. • Over 1,000 books, magazines, comics, and more included with Amazon Prime. GO BEYOND PAPER Turn your iPhone or iPad into a book with the free Kindle app—so you can read anytime, anywhere. Explore these reading features in the Kindle app: • Read your way. Customize your text size, font type, margins, text alignment, and orientation (portrait or landscape)—and choose whether to turn pages from left to right or continuously scroll. Read comfortably day and night with adjustable brightness and background colors. Go to the Aa menu in your book to get started. • Look up words, people, and places while you read. Breeze through words you don’t know and characters you can’t remember with the built-in dictionary, X-Ray, Wikipedia lookup, instant translations, and search within your book. Simply tap and hold a word to view its definition, or use the Google and Wikipedia links to get more information. • Track your reading progress. See what percent of the book you’ve read, real page numbers (for most top titles), and how much time you have left in the chapter or book based on your actual reading speed. • Bookmark places you want to revisit, and make highlights and take notes throughout your book. Open My Notebook to see all your notes in the same place. • Hop, skim, and jump with Page Flip. Flip between pages or get a bird’s-eye view of your book with Page Flip—don’t worry, we’ll save your place. • Zoom in on high-definition color images in Kindle books, magazines, comics, and manga. • Sync your books across devices. When you’re reading a book, the Kindle app will automatically sync where you left off—along with any bookmarks, highlights, or notes—so you can start reading on one device and pick up where you left off on another. • When you can’t read, listen. Switch seamlessly from reading your Kindle book to listening to the Audible book, all within the Kindle app. • Get notified when authors you love have new releases. By using this app, you agree to Amazon’s Conditions of Use (www.amazon.com/conditionsofuse) and Privacy Notice (www.amazon.com/privacy).

About

KyBook 3 Ebook Reader

This app is a versatile e-book reader and cataloger supporting numerous formats like EPUB, MOBI, and PDF. It offers a comfortable reading experience with customizable options, powerful annotation tools, and seamless cloud storage integration. Organize your library with tags, collections, and a handy cataloguer.

Highlights
  • Supports all major e-book formats
  • OPDS catalog access
  • Comfortable reading mode with themes
  • Powerful annotations and summary editor
  • Handy cataloguer with tagging
  • Cloud storage integration
Features
Read full description

KyBook is the application for reading and cataloging e-books in a modern, user-friendly style. KyBook supports all the major e-book formats, OPDS catalogs and Cloud Storage. Key features • All the major e-book formats • OPDS catalogs • Comfortable reading mode • Powerful annotations • Handy cataloguer • Cloud Storage Ebook Formats • EPub (DRM-free) • PDF (DRM-free) • MobiPocket and Kindle (mobi, azw3) • DjVu • FictionBook (fb2, fb2.zip) • Comic Book (cbr, cbz, cbt) • Audio Book (mp3, m4a, m4b) • Plain and rich text (txt, rtf) OPDS Catalogs • Provides access to enormous collection of free electronic books through OPDS-catalogs support. • Built-in list of well-known OPDS Catalogs • Allows add own catalog (e.g. Calibre content server) • Supports for .onion OPDS Catalogs reachable via Tor Network Comfortable reading mode • Themes, color schemes for reading (day, night, sepia and more). • Page turn with scroll, curl and slide. • Designed to be fast, energy efficient, optimized for very large books (books in millions of words) • Auto scrolling mode • Text-to-speech technology to voice any e-book EPUB/FB2/MOBI specific features • Customizable font, text size, page margins, paragraph indentation, background and more • Typography aware (hanging punctuation, hyphenations and more) PDF/DJVU specific features • Crops a page margins in manual and automatic mode • Smart zooming by double-tap • PDF Reflow on iPhone • Page text recognition (OCR) Powerful annotations • Marked text and bookmarks • Drawn annotations in any ebook (Apple Pencil support and just by touching). • Annotations exports in Markdown, HTML, PDF, RTF formats. Built-in the summary editor • Markdown formatting. • Exports summaries in Markdown, HTML, PDF, RTF formats. Working with fragments of text • Translation of separate words or complete sentences in different languages. • Search for a word definition in dictionaries. • Custom dictionaries in Dictd, StarDict and Lingvo DSL format • Full text searching in a book (textual, fuzzy and search using regular expressions). • Built-in search for a selected text on the Internet or Wikipedia. Handy cataloguer • Grouping by categories: by authors, subjects, sequences, publishers, tags, popular, recent, new, unread, reading and finished. • Tags and collections to categorize ebooks. • Search for books in the library and anywhere in the Internet. • Own folders tree and flexible bookshelf settings for layout and sorting. • Arranging books on a bookshelf by dragging. Working with a metadata and a table of contents • Automated extraction of a metadata from ebooks. • Convenient editing of a metadata. • Editing and creation (automatic or manual) of a table of contents. File Storage • Locally on the device. • In the Cloud Storage (iCloud Drive, Google Drive, OneDrive, Dropbox, Yandex Disk). • In the Local network on Shared Folders (SMB/CIFS) or on WebDAV server • Transparent caching of books in the Internet or Local network. • Supports of streaming audio books in Cloud Storage. • Content Server for accessing files on the device via a WiFi. Synchronization (requires subscription) • Syncs all ebooks metadata and files. KyBook offers the following subscriptions options: • 3 months: 4.49 USD • 1 year: 14.99 USD Prices may vary in other countries respecting your local currency exchange rate. Your subscription will be charged to your iTunes account. At the end of the term, unless auto-renewables subscriptions are disabled, your subscription will automatically renew in your iTunes account. You will be charged for the regular price of your subscription within 24 hours prior to the end of the current term. You can turn off automatic renewal in your iTunes account settings at any time, but you must do so at least 24 hours before the end of the current term. Refunds will not be provided for the unused portion of any term. Terms & Privacy policy http://kybook-reader.com/terms http://kybook-reader.com/privacy-policy

Screenshots

Amazon Kindle4 screens
KyBook 3 Ebook Reader4 screens

Verdict

The call

The clearest difference is in-app purchases: Amazon Kindle at none against KyBook 3 Ebook Reader's 4. Amazon Kindle also leads on ratings volume (5.9M vs 4.8K) and chart position (#4 vs unranked). KyBook 3 Ebook Reader's advantage is update cadence (every 5 days vs fortnightly) and iOS requirement (11.0 vs 17.0). On price, rating, review sentiment and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. KyBook 3 Ebook Reader sells 4 in-app purchases, starting at $4.49 per 3 months. Amazon Kindle asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Amazon Kindle holds the better App Store score, 4.9 against 4.7. That said, the two scores are not equally well evidenced: Amazon Kindle has 5.9M ratings behind it against 4.8K, so its average is the more settled of the two. Written reviews point the same way: 68% of Amazon Kindle's written reviews are positive against 61% of KyBook 3 Ebook Reader's.

UpkeepUpdate frequency

Amazon Kindle ships an update fortnightly, KyBook 3 Ebook Reader every 5 days. Both last shipped on November 6, 2026.

Scorecard6 real differences · 5 level
Amazon Kindle versus KyBook 3 Ebook Reader: the parameters behind the verdict, then further details
ParameterAmazon KindleKyBook 3 Ebook Reader
PriceFreeFree
Rating4.9 (5.9M ratings) — better4.7 (4.8K ratings)
Positive reviews67.6% of reviews — better61.0% of reviews
Number of ratings5.9M — better4.8K
Update frequencyFortnightlyEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Best chart rank#4 — better—
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS17.011.0 — better
Further details — not scored
Size206 MB53 MB
Age rating12+17+
DeveloperAMZN Mobile LLCKonstantin Bukreev

Customer experience

Amazon Kindle

All ratings5,884,659 ratings
Positive97.6%
Neutral1.4%
Negative1.0%
Written reviews8,817 reviews
Positive67.6%
Neutral8.8%
Negative23.7%

KyBook 3 Ebook Reader

All ratings4,616 ratings
Positive91.6%
Neutral3.2%
Negative5.2%
Written reviews677 reviews
Positive61.0%
Neutral10.0%
Negative29.0%

User reviews

Amazon Kindle

From 5.9M App Store ratings

What we love

  • 📚 Huge library of books
  • 📱 Portable and convenient
  • 🔍 Useful features like dictionary lookup and highlighting
  • 🌙 Adjustable reading settings (font, brightness, etc.)
  • 🔁 Seamless syncing across devices

Room to improve

  • 🛒 Cannot purchase books directly in the app
  • 🗂️ Difficulty organizing and managing large book libraries
  • 🔍 Inconsistent behavior when highlighting/taking notes
  • 🔄 Unreliable syncing between devices
  • 🔌 Drains device battery quickly

KyBook 3 Ebook Reader

From 4.8K App Store ratings

What we love

  • 🚀 Excellent design, close to no ads
  • 🚀 Handles various file formats well
  • 👍 Customizable, lots of features
  • 👍 Stable and fast
  • 👍 Good for reading comics/manga

Room to improve

  • 🐛 Sync and account issues
  • 🐛 Crashes, bugs, and compatibility problems
  • 🔍 Confusing interface, hard to use
  • 💰 Paid features and subscription model
  • 🔍 Missing key features like page turn animation

Bugs and requests

Amazon Kindle

Reported bugs

3 issues
  • App crashes or freezes when switching between apps
  • Incompatibility issues with newer iOS versions
  • Dictionary lookup feature not working reliably

Requested features

5 requests
  • Ability to create and manage collections/folders for books
  • Option to easily see which books have been read vs unread
  • Improved highlighting and note-taking functionality
  • Better syncing between Kindle devices and apps
  • Dark mode and other customization options

KyBook 3 Ebook Reader

Reported bugs

5 issues
  • Inability to open/read certain file formats
  • Sync and account creation issues
  • Problems with PDF and image display
  • Crashes and compatibility problems
  • Duplication of books in library

Requested features

6 requests
  • Left alignment option
  • Dark mode/OLED black theme
  • Improved image handling
  • Better support for Chinese language
  • Vertical page flip
Show 1 more
  • Improved text-to-speech capabilities

In-app purchases

None

Amazon Kindle

No in-app purchases

4 purchases

KyBook 3 Ebook Reader

Subscriptions2
  • 3 months subscription7 Days trial$4.493 Months
  • Yearly subscription7 Days trial$14.991 Year
One-time2
  • Upgrade to Pro (Discount)$2.99
  • Upgrade to Pro$4.99

Questions

Is Amazon Kindle free?
Amazon Kindle is free to download, with no in-app purchases.
Is KyBook 3 Ebook Reader free?
KyBook 3 Ebook Reader is free to download, with in-app purchases available.
Which has better reviews, Amazon Kindle or KyBook 3 Ebook Reader?
Amazon Kindle is rated higher. Amazon Kindle averages 4.9 out of 5 from 5.9M ratings, while KyBook 3 Ebook Reader averages 4.7 from 4.8K ratings.
Do Amazon Kindle or KyBook 3 Ebook Reader have ads?
Neither Amazon Kindle nor KyBook 3 Ebook Reader shows ads.
Which is updated more often, Amazon Kindle or KyBook 3 Ebook Reader?
Amazon Kindle ships an update fortnightly, and KyBook 3 Ebook Reader every 5 days. Most recently, Amazon Kindle was updated on November 6, 2026 and KyBook 3 Ebook Reader on November 6, 2026.

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